Fuse device and operation method thereof

Abstract

The fuse device includes a plurality of fuse circuits, a global latch circuit and a plurality of local latch circuits. The global latch circuit is coupled to the fuse circuits. The global latch circuit is used to sense the blown states of the fuse circuits at different times, so as to output the fuse information of the fuse circuits at the different times. The local latch circuits are coupled to the global latch circuits. Each of these local latch circuits latches the fuse information output by the global latch circuit at the different times.

What is claimed is: 
     
       1. A fuse device, comprising:
 a plurality of fuse circuits; 
 a global latch circuit, coupled to the plurality of fuse circuits, configured for sensing blown states of the plurality of fuse circuits at different times, so as to output fuse information of the plurality of fuse circuits at the different times; and 
 a plurality of local latch circuits, coupled to the global latch circuit, wherein each of the plurality of local latch circuits latches the fuse information output by the global latch circuit at the different times. 
 
     
     
       2. The fuse device according to  claim 1 , wherein each of the plurality of fuse circuits comprises:
 an anti-fuse, having a first terminal coupled to the global latch circuit; and 
 a blown pad, coupled to a second terminal of the anti-fuse, configured for coupling to an external blown voltage source when the anti-fuse is blown. 
 
     
     
       3. The fuse device according to  claim 1 , wherein the global latch circuit comprises:
 a fuse latch circuit, having an output terminal coupled to an input terminal of each of the plurality of local latch circuits; and 
 a selection circuit, having a common terminal coupled to the fuse latch circuit, wherein a plurality of selection terminals of the selection circuit are coupled to the plurality of fuse circuits in a one-to-one manner, and the selection circuit is configured for selectively coupling one of the plurality of fuse circuits to the fuse latch circuit. 
 
     
     
       4. The fuse device according to  claim 3 , wherein the fuse latch circuit comprises:
 a blown switch, having a first terminal and a second terminal respectively coupled to the common terminal of the selection circuit and a reference voltage source, wherein the blown switch is turned on when any one of the plurality of fuse circuits is blown, and the blown switch is turned off when the plurality of fuse circuits are not blown; 
 an enable switch, having a first terminal coupled to the common terminal of the selection circuit; 
 a read switch, having a first terminal and a second terminal respectively coupled to a read voltage source and a second terminal of the enable switch; and 
 a NOT gate, having an input terminal coupled to the second terminal of the enable switch, wherein an output terminal of the NOT gate is coupled to the output terminal of the fuse latch circuit. 
 
     
     
       5. The fuse device according to  claim 4 , wherein the fuse latch circuit further comprises:
 a first transistor, having a first terminal and a second terminal respectively coupled to the read voltage source and the input terminal of the NOT gate, wherein a control terminal of the first transistor is coupled to the output terminal of the NOT gate; 
 a second transistor, having a first terminal coupled to the input terminal of the NOT gate, wherein a control terminal of the second transistor is coupled to the output terminal of the NOT gate; and 
 a third transistor, having a first terminal and a second terminal respectively coupled to the reference voltage source and a second terminal of the second transistor, wherein a control terminal of the third transistor is coupled to a control terminal of the read switch. 
 
     
     
       6. The fuse device according to  claim 3 , further comprising:
 a controller, configured for generating a fuse address; and 
 a decoder, coupled to the controller to receive the fuse address, configured for decoding the fuse address to generate a plurality of word line signals to the selection circuit, wherein the selection circuit selects one of the plurality of fuse circuits according to the plurality of word line signals. 
 
     
     
       7. The fuse device according to  claim 6 , wherein the controller comprises:
 an enabling signal generating circuit, configured to generate an enabling signal; 
 an oscillator, controlled by the enabling signal to selectively generate a clock signal; and 
 an address counter, coupled to the oscillator to receive the clock signal, and configured to count the clock signal to generate the fuse address to the decoder. 
 
     
     
       8. The fuse device according to  claim 1 , wherein each of the plurality of local latch circuits comprises:
 a latch; and 
 a switch, having a first terminal and a second terminal respectively coupled to an output terminal of the global latch circuit and an input terminal of the latch, wherein the switch is turned on to transmit the fuse information of one corresponding fuse circuit among the plurality of fuse circuits to the input terminal of the latch when the global latch circuit reads the corresponding fuse circuit, and the switch is turned off when the global latch circuit does not read the corresponding fuse circuit. 
 
     
     
       9. The fuse device according to  claim 8 , further comprising:
 a controller, configured for generating a source enable pulse; and 
 a shift register, coupled to the controller to receive the source enable pulse, configured for shifting the source enable pulse based on a clock to generate a plurality of enable pulses with different phases for the plurality of local latch circuits, wherein each of the plurality of local latch circuits latches the fuse information output by the global latch circuit according to one corresponding enable pulse among the plurality of enable pulses. 
 
     
     
       10. An operation method of a fuse device, comprising:
 sensing blown states of a plurality of fuse circuits of the fuse device at different times by a global latch circuit of the fuse device; 
 outputting fuse information of the plurality of fuse circuits by the global latch circuit at the different times; and 
 latching the fuse information output by the global latch circuit at the different times by a plurality of local latch circuits of the fuse device.